Three-Wire Interface Operation - Hitachi SJ300 Series Instruction Manual

Three-wire
The 3-wire interface is an industry standard motor control interface. This function uses two
inputs for momentary contact start/stop control, and a third for selecting forward or reverse
Interface
direction. To implement the 3-wire interface, assign 20 [STA] (Start), 21 [STP] (Stop), and 22
Operation
[F/R] (Forward/Reverse) to three of the intelligent input terminals. Use momentary contact for
Start and Stop. Use a selector switch, such as SPST for the Forward/Reverse input. Be sure to
set the operation command selection A002=01 for input terminal control of motor.
If you have a motor control interface that needs logic-level control (rather than momentary
pulse control), use the [FW] and [RV] inputs instead.
Valid for
inputs:
Required
settings:
Notes:
• The STP logic is inverted. Normally the
• When you configure the inverter for 3-wire
The diagram below shows the use of 3-wire control. STA (Start Motor) is an edge-sensitive
input; an OFF-to-ON transition gives the Start command. The control of direction is level-
sensitive, and the direction may be changed at any time. STP (Stop Motor) is also a level-
sensitive input.
Opt.
Symbol Function Name
Code
20 STA Start Motor
21 STP Stop Motor
22 F/R Forward/Reverse
C001, C002, C003, C004,
C005, C006, C007, C008
A002=01
switch will be closed, so you open the switch
to stop. In this way, a broken wire causes the
motor to stop automatically (safe design).
interface control, the dedicated [FW] terminal
is automatically disabled. The [RV] intelligent
terminal assignment is also disabled.
[STA] terminal
[STP] terminal
[F/R] terminal
Motor revolution speed
SJ300 Inverter
Input
Description
State
ON Start motor rotation on momentary
contact (uses acceleration profile)
OFF No change to motor operation
ON No change to motor operation
OFF Stop motor rotation on momentary contact
(uses deceleration profile)
ON Select reverse direction of rotation
OFF Select forward direction of rotation
Example: (Requires input configuration—
see page 3–47. Jumper position shown is
for –xFU/-xFR models; for –xFE models,
see page 4–12.)
F/R
TH FW
8
P24 PLC CM1
7
See I/O specs on page 4–9.
Forward
Reverse
4–29
STP
STA
CM1
5 3 1
6 4 2
t